Download App

Photometry — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsPhotometry1 Mark
Question
Light from a point source falls on a small area placed perpendicular to the incident light. If the area is rotated about the incident light by an angle of 60°, by what fraction will the illuminance change?
✓

Answer

The illuminance will not change.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "1 Marks Question" from Photometry→Photometry — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

According to kinetic theory of gases, molecules of a gas behaves like ________.
→
What is the nature of waves produced in a tuning fork?
→
A transverse harmonic wave on a string is described by
$\text{y}(\text{x, t})=3.0\sin\big(36\text{t}+0.018\text{x}+\frac{\pi}{4}\big)$
where x and y are in cm and t in s. The positive direction of x is from left to right.
What is the initial phase at the origin?
→
Write the use of Wien's displacement law.
→
A copper strip AB and an iron strip AC are joined at A. The junction A is maintained at 0°C and the free ends B and C are maintained at 100°C. There is a potential difference between:
  1. The two ends of the copper strip.
  2. The copper end and the iron end at the junction.
  3. The two ends of the iron strip.
  4. The free ends B and C.
→
Answer the following questions based on the P-T phase diagram of carbon dioxide
  1. At what temperature and pressure can the solid, liquid and vapour phases of CO2 co-exist in equilibrium ?
  2. What is the effect of decrease of pressure on the fusion and boiling point of CO2?
  3. What are the critical temperature and pressure for CO2? What is their significance?
  4. Is CO2 solid, liquid or gas at (a) –70 °C under 1 atm, (b) –60 °C under 10 atm, 15 °C under 56 atm?
→
Why do fire fighters have a jet attached to the head of their water pipes?
→
0.2 meter radius and 2 kg. A disc of mass m is rotating around its own axis. What will be the moment of Inertia of the disc?
→
Does the radius of gyration depend upon the speed of rotation of the body?
→
A piece of lead is hammered. Does its internal energy increase? Does the heat enter the lead from outside?
→